Annealing-furnace.



No. 793,501. PATENTED JUNE 27, 1905. C. BECHSTEIN. ANNEALING FUR'NAGE.

APPLIOATION FILED JUNE 28, 1904.

2 HEETS-SHEET 1.

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No. 793,501. PATENTED JUNE 27, 1905. o. BEGHSTEIN.

ANNEALING FURNAGE.

APPLICATION FILED .TUNE 28,1904.

2 SHEETS-SHEET 2.

/f //l lIE W4/,Kfm 4 am "NTTED STATES Patented June 27, 1905.

PATENT OFFICE.

ANNEALING-FURNACE.

SPEGIFICATION forming part of Letters Patent No. 793,501, dated June 27, 1905.

Application filed June 28, 1904:. Serial No. 214,482.

To all whom it may concern:

Be it known that I, CARL BEcT-IsTEIN, a citizen of the German Empire, residing at Cannstatt, in the Kingdom of I/Viirtemberg, Germany, have invented certain new and useful Improvements in Annealing-Furnaces, of which the following is a description, reference being had to the accompanying drawings and to the figures of reference marked thereon.

This invention relates to metal-annealing furnaces, and has for its principal object to provide a structure in which the oven may be raised to the proper temperature at a minimum of expense and time, and, further, to so arrange the-furnace that the temperature may be accurately regulated.

With these and other objects in view the invention consists in the novel construction and arrangement of parts hereinafter described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the construction and proportion of parts may be made without departing from the spirit of the invention.

In the accompanying drawings, Figure 1 is a longitudinal sectional elevation of an annealing-furnace constructed in accordance with the invention. Fig. 2 is a transverse sectional elevation of the same. Fig. 3 is a sectional plan view of the furnace on the line A A of Fig. 1. Fig. 4 is a similar view on the line B B of Fig. 1. Fig. 5 is a sectional plan view on the line C C of Fig. 1, and Fig. 6 is a perspective View of the furnace.

Similar numerals of referencey are employed to indicato corresponding parts throughout the several figures of the drawings.

The furnace 2, preferably of the portable type, is carried by a wheeled frame 1 and is formed of lire-clay or similar refractory material. In the lower portion of the furnace is a combustion-chamber, of which the grate is indicated at 3, that is separated from the oven 5 by a horizontal partition or arch. In

the upper portion of the side walls of the combustion-chamber are side flues 4, leading to the lower portion of the oven, and through which all of the products of combustion must pass.

The top of the oven is formed by an arch having a centrally-disposed flue 6 leading to an upper flue-space 11. This fine-space is divided from an outer flue l1 by baffle-walls l1', and the products of combustion finally pass to the escape-flue l2.

The top of the furnace is in part formed of a plate or brick 14, having a central guidingopening for a stem 15, that carries at its lower end a heavy damper 7, which may be raised, as shown in Fig. 1, or lowered, as shown in Fig. 2. To the upper end of the stem is connected one end of a lever 8, the opposite end of which carries a chain 9 for convenience in manipulating the damper.

Leading from the upper portions of the side walls of the oven are flues 10, in which are baifle-walls 10, under which the products of combustion must pass and thence are directed upward to the upper flue-space 11a.

During the preliminary heating up,the damper 7 is open and the products of combustion pass through flues 4 into the oven and thence through iiue 6, flue 11, and Hue-space 11 to the escape-flue 12, a small proportion of the heat passing also through the side iiues 10. The Workman is enabled by observation through sight-holes 13 to approximately determine the temperature ofthe oven, and when heated suiiiciently the damper 7 is wholly or partly closed, causing some or all of the products of combustion to pass through the side iues 10 and heat the walls of the oven, thus maintaining the temperature without risk of sudden reductions due to loss by radiation or otherwise. It will thus be seen that the oven may be heated direct during the early stages and thereafter gradually brought to the desired temperature and this temperature maintained by heating both the bottom, top, and side walls of the oven.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is"- 1. In an annealing-furnace, an oven having a top iue and downwardly-directed side-wall iues leading from the upper portion of the oven, a damper for the top iiue, and a combustion-eharnber having side-fine connections with the oven; substantially as described.

2. In an annealing-furnace, an oven having a top iue and side-wall iiues, there being an upper flue-space above the Oven with which both fines communicate, a damper for the top Hue, a combustion-chamber below the oven,

and side fines between the upper portion of 1 the combustion-chamber and the lower portion of the oven; substantially as described.

In testimony whereof I aiix my signature in presence of two witnesses.

CARI? BECHSTEIN.

Witnesses:

WALTER SoHwAEBsCH, RUDOLF BREoI-I'r. 

